double-cross

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Related to double-crossing: betraying, backstabbing

double-cross

(dŭb′əl-krôs′, -krŏs′)
tr.v. double-crossed, double-crossing, double-crosses
To betray by acting in contradiction to a prior agreement.
n.
1. often double cross An act of betraying an ally, friend, or associate.
2. double cross Genetics A cross in which each parent is the product of a single cross. It can be represented as AB × CD, where A, B, C, and D are inbred lines.

dou′ble-cross′er n.